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Show 1878.] MR. E. J. MIERS ON THE PENiEID^E. 299 Peneeus marginatus, Randall, Journ. Ac. Nat. Sci. Phil. viii. p. 146 (1839). ? Peneeus plebejus, Hess. Arch. f. Nat. p. 168, pl. vii. fig. 19 (1865). The series in the British-Museum collection includes specimens from the Gulf of Suez, Shanghai, Yokohama (Japan), Torres Straits, Shark Bay, Houtmann's Abrolhos, Sir-C.-Hardy Island, and the Loyalty Islands (Lifu). In both sexes there is a single spine on the second joint of the first and second pairs of legs, and none on the third pair of legs. In the closely allied European P. caramote there is, besides these spines, a spine upon the first joint of each of the first three pairs of legs. The sixth postabdominal segment is not sulcate in either species ; and in both the terminal segment is armed with lateral marginal spines. PENEEUS BRASILIENSIS. Peneeus brasiliensis, Latr. Nouv. Diet. Hist. Nat. xxv. p. 256 (1817); M.-Edw. Hist. Nat. Crust, ii. p. 414 (1837); Stimpson, Ann. Lye. Nat. Hist. N e w York, x. p. 132 (1871). This species in external characters closely resembles the preceding, but differs in the following particulars :-There is a spine upon the second and third joints of the first pair of legs, one upon the second joint of the second pair of legs, and none upon the third pair of legs. The sixth postabdominal segment is grooved on either side of the longitudinal median carina on its upper surface. There are no spines on the lateral margins of the seventh postabdominal segment. Specimens from Whydah on the west coast of Africa agree in all respects with authentic specimens from Brazil presented by the Paris Museum, and with specimens from the West Indies (Barbadoes) and North America, proving that this, like many other species. occurs on both sides of the Atlantic. PENEEUS SEMISULCATUS. Peneeus semisulcatus, De Haan, Faun. Japon. Crust, p. 191, pl. xlvi. fig. 1 (1849). A large series of specimens of both sexes is in the Museum collection, agreeing with De Haan's description and figure. It is probable that under the Fabrician name of P. monodon two closely allied but apparently distinct species were confounded by earlier authors. In P. semisulcatus the rostrum is 7-8-toothed above and 3-toothed below, the dorsal carina, which is faintly or obsoletely canaliculated, extends to the posterior margin of the carapace, and the gastro-hepatic sulcus is faintly defined. There are examples from India (Pondicherry, Calcutta), Formosa, the Philippines, North Australia, and the Fiji Islands (Mbau), in the Museum collection. In two specimens from Australia (Shark Bay), and one from Ceylon, the rostrum is 6-7-toothed above, the teeth toward 1 he apex separated by much wider intervals than in the specimens referred to |
